Information about your particular concert will be sent out via email a few days before the concert, the email will be sent to the same address that was registered when purchasing the ticket, make sure you have access to this inbox.
Please note that all the necessary information is in the email that you will receive before the concert, read this carefully, and proceed from that information despite other general information on the website, ticket, etc. The entrance, the times and other directives you receive in the information letter are those you must follow.